Mr. Smith made many tests (作试验) with different animals and the monkey was the cleverest of all the animals. One day Mr. Smith put a monkey in a room. He also put some small boxes in it. In one of the boxes there was some food. "How long will it take the monkey to find the food?" Mr. Smith said to himself. "Let me wait and see." He left the room and waited outside. Three minutes later, he put his eye to the keyhole (钥匙眼). What did he see? He saw the eye of the monkey. The monkey was on the other side of the door and looked at Mr. Smith through the keyhole.

我们民族近年来经历了太多的困难，地震、泥石流……尽管如此，我们仍然成功举办了上海世博会……一道道坎、一个个弯，没有难倒中国人民，一次次跨越，一个个成功都彰显中华民族精神的伟大力量，这种民族精神的核心是（    ）

一定时期的报纸反映了一定时期的社会面貌，有些词会频繁见诸于报端，抓住这些关键词有助于把握当时的历史面貌。与“争取和平”、“保家卫国”、“谈判协定”三个关键词直接相关的历史事件是（    ）